Interesting topic as I prepare to fire my engine sometime soon…
Edelbrock 87cc heads w/CNC chambers.
Comp 305H HFT camshaft - 253/
[email protected] .350 lobe lift.
Comp 1.65 roller rockers = .577 total lift.
Heads are untouched.
My set-up for these heads is a Comp 950 spring for the above HFT. Free lift before CB (1.2) +.060 is .640, which allows for some additional room if I want to step things up a bit.
Published IH from Comp is 1.9”, but I want to target a spring seat pressure of 125-130 AFTER break-in.
With a locator and shims I have the springs set right at 1.865” - 1.875” IH and had them bench tested at a local machine shop on a Rimac tester at my desired IH (1.87) with a Comp tool steel retainer I’m planning to use. They all came in right at 140-145lbs. and 330lbs. at 1.3” (CB is 1.2”).
Pretty consistent and accurate per published specs from Comp Cams.
Bottom of retainer to top of valve seal clearance is .900 free length with the longer valves I’m using (Ferrea 6000 5.275 length). Used a Mitutoyo telescoping gauge that was locked and then measured with a Mitutoyo 2”-6” digital dial caliper.
Comp cam was purchased used from this board (Paul K) and looks good. No unusual wear that I would call out. I put the cam in my Goodson V blocks and rolled it through to check lift on each lobe with a dial indicator mounted on a magnetic stand and they all show .350 as published.
I will use Rhoads lifters on the intakes only.
Sound good or do I need to do a heel pivot to avoid any surprises?